青藏高原狮泉河-拉果错-永珠-嘉黎蛇绿混杂岩带时空结构与构造演化

王保弟; 刘函; 王立全; 贺娟; 王冬兵; 李奋其; 吴喆

doi:10.3799/dqkx.2020.083

Volume 45 Issue 8

Aug. 2020

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Article Navigation > Earth Science > 2020 > 45(8): 2764-2784

Wang Baodi, Liu Han, Wang Liquan, He Juan, Wang Dongbing, Li Fenqi, Wu Zhe, 2020. Spatial-Temporal Framework of Shiquanhe-Laguoco-Yongzhu-Jiali Ophiolite Mélange Zone, Qinghai-Tibet Plateau and Its Tectonic Evolution. Earth Science, 45(8): 2764-2784. doi: 10.3799/dqkx.2020.083

Citation:

Wang Baodi, Liu Han, Wang Liquan, He Juan, Wang Dongbing, Li Fenqi, Wu Zhe, 2020. Spatial-Temporal Framework of Shiquanhe-Laguoco-Yongzhu-Jiali Ophiolite Mélange Zone, Qinghai-Tibet Plateau and Its Tectonic Evolution. Earth Science, 45(8): 2764-2784. doi: 10.3799/dqkx.2020.083

Citation:

Wang Baodi, Liu Han, Wang Liquan, He Juan, Wang Dongbing, Li Fenqi, Wu Zhe, 2020. Spatial-Temporal Framework of Shiquanhe-Laguoco-Yongzhu-Jiali Ophiolite Mélange Zone, Qinghai-Tibet Plateau and Its Tectonic Evolution. Earth Science, 45(8): 2764-2784. doi: 10.3799/dqkx.2020.083

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Spatial-Temporal Framework of Shiquanhe-Laguoco-Yongzhu-Jiali Ophiolite Mélange Zone, Qinghai-Tibet Plateau and Its Tectonic Evolution

doi: 10.3799/dqkx.2020.083

Wang Baodi^{1, 2
,
,},
Liu Han^{1, 2},
Wang Liquan^{1, 2},
He Juan^{1, 2},
Wang Dongbing^{1, 2},
Li Fenqi^{1, 2},
Wu Zhe^{1, 2}

1.
Chengdu Center of China Geological Survey, Chengdu 610081, China
2.
Research Center for Tibetan Plateau Geology, China Geological Survey, Chengdu 610081, China

Received Date: 2020-03-25
Publish Date: 2020-08-15

Abstract

Abstract

The Shiquanhe-Laguoco-Yongzhu-Jiali ophiolite mélange zone (SYMZ) is located between the Bangongco-Nujiang suture zone and the Yarlung-Zangbo suture zone in the central Qinghai-Tibet Plateau. The tectonic property of the SYMZ remains controversial, which restricts the application of archipelagic arc-basin system theory to the evolution of Qinghai-Tibet Plateau. Based on recent geological survey information, research results and comprehensive data analyses, in this paper, it summarizes the geological feature and discusses the tectonic process of the SYMZ. The SYMZ represents an independent ophiolitic mélange zone dividing the north Lhasa Terrane and central Lhasa Terrane, which is part of the Tethyan archipelagic arc-basin system. The typical ophiolite mélange suites are distributed in such places as Shiquanhe, Laguoco, Aso, Yongzhu and Kaimeng, and high precision geochronology data show that the main ocean basin was formed during 178-160 Ma, which was about 10 Ma later than the formation of the Bangongco-Nujiang ocean basin (188-162 Ma). The Aso ophiolitic mélange reflects that the SYMZ ocean basin had existed until 113 Ma. The Jurassic mafic rocks of the SYMZ show the geochemistry characteristics of MORB and IAT, belonging to the Oceanic Arc and MORB type ophiolites. The Early Cretaceous mafic rocks show both MORB and arc basalt characters, suggesting they probably formed in the tectonic setting of SSZ, different from the contemporaneous Bangongco-Nujiang ocean which was influenced by the mantle plume. The Jurassic boninites and bonibasalts series places like Laguoco, Yongzhu and Kaimeng were found in this study, indicating the intra-oceanic subduction of the SYMZ oceanic slab. Combined all these new discoveries with regional geological data, the spatial-temporal framework of the SYMZ Tethyan Ocean and its tectonic evolution history are established. The SYMZ Tethyan Ocean opened and spread in Late Triassic-Early Jurassic, the intra-oceanic subduction lasted during Middle-Late Jurassic, oceanic slab subduction begun in the Early Cretaceous, and finally ocean basin was extinct in the late Early Cretaceous. This study provides important geological evidences for understanding the lithosphere evolution and tectonic process of the Tethyan.
- Shiquanhe-Laguoco-Yongzhu-Jiali ophiolite mélange zone,
- Bangongco-Nujiang suture zone,
- intra-oceanic subduction,
- SSZ type ophiolite,
- Tethyan,
- tectonic evolution,
- Qinghai-Tibet Plateau,
- structural geology

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References(136)

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Spatial-Temporal Framework of Shiquanhe-Laguoco-Yongzhu-Jiali Ophiolite Mélange Zone, Qinghai-Tibet Plateau and Its Tectonic Evolution

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